自学教程：C++ CORRADE_ASSERT函数代码示例

Trade::MeshData3D Capsule3D::solid(UnsignedInt hemisphereRings, UnsignedInt cylinderRings, UnsignedInt segments, Float halfLength, TextureCoords textureCoords) {    CORRADE_ASSERT(hemisphereRings >= 1 && cylinderRings >= 1 && segments >= 3, "Capsule must have at least one hemisphere ring, one cylinder ring and three segments", Trade::MeshData3D(MeshPrimitive::Triangles, std::vector<UnsignedInt>{}, std::vector<std::vector<Vector3>>{}, std::vector<std::vector<Vector3>>{}, std::vector<std::vector<Vector2>>{}));    Implementation::Spheroid capsule(segments, textureCoords == TextureCoords::Generate ?        Implementation::Spheroid::TextureCoords::Generate :        Implementation::Spheroid::TextureCoords::DontGenerate);    Float height = 2.0f+2.0f*halfLength;    Float hemisphereTextureCoordsVIncrement = 1.0f/(hemisphereRings*height);    Rad hemisphereRingAngleIncrement(Constants::pi()/(2*hemisphereRings));    /* Bottom cap vertex */    capsule.capVertex(-height/2, -1.0f, 0.0f);    /* Rings of bottom hemisphere */    capsule.hemisphereVertexRings(hemisphereRings-1, -halfLength, -Rad(Constants::pi())/2+hemisphereRingAngleIncrement, hemisphereRingAngleIncrement, hemisphereTextureCoordsVIncrement, hemisphereTextureCoordsVIncrement);    /* Rings of cylinder */    capsule.cylinderVertexRings(cylinderRings+1, -halfLength, 2.0f*halfLength/cylinderRings, 1.0f/height, 2.0f*halfLength/(cylinderRings*height));    /* Rings of top hemisphere */    capsule.hemisphereVertexRings(hemisphereRings-1, halfLength, hemisphereRingAngleIncrement, hemisphereRingAngleIncrement, (1.0f + 2.0f*halfLength)/height+hemisphereTextureCoordsVIncrement, hemisphereTextureCoordsVIncrement);    /* Top cap vertex */    capsule.capVertex(height/2, 1.0f, 1.0f);    /* Faces */    capsule.bottomFaceRing();    capsule.faceRings(hemisphereRings*2-2+cylinderRings);    capsule.topFaceRing();    return capsule.finalize();}

Trade::MeshData3D Cylinder::solid(const UnsignedInt rings, const UnsignedInt segments, const Float halfLength, const Flags flags) {    CORRADE_ASSERT(rings >= 1 && segments >= 3, "Primitives::Cylinder::solid(): cylinder must have at least one ring and three segments", Trade::MeshData3D(MeshPrimitive::Triangles, {}, {}, {}, {}));    Implementation::Spheroid cylinder(segments, flags & Flag::GenerateTextureCoords ? Implementation::Spheroid::TextureCoords::Generate : Implementation::Spheroid::TextureCoords::DontGenerate);    const Float length = 2.0f*halfLength;    const Float textureCoordsV = flags & Flag::CapEnds ? 1.0f/(length+2.0f) : 0.0f;    /* Bottom cap */    if(flags & Flag::CapEnds) {        cylinder.capVertex(-halfLength, -1.0f, 0.0f);        cylinder.capVertexRing(-halfLength, textureCoordsV, Vector3::yAxis(-1.0f));    }    /* Vertex rings */    cylinder.cylinderVertexRings(rings+1, -halfLength, length/rings, textureCoordsV, length/(rings*(flags & Flag::CapEnds ? length + 2.0f : length)));    /* Top cap */    if(flags & Flag::CapEnds) {        cylinder.capVertexRing(halfLength, 1.0f - textureCoordsV, Vector3::yAxis(1.0f));        cylinder.capVertex(halfLength, 1.0f, 1.0f);    }    /* Faces */    if(flags & Flag::CapEnds) cylinder.bottomFaceRing();    cylinder.faceRings(rings, flags & Flag::CapEnds ? 1 : 0);    if(flags & Flag::CapEnds) cylinder.topFaceRing();    return cylinder.finalize();}

template<UnsignedInt dimensions> ImageData<dimensions>::operator CompressedImageView<dimensions>() const{    CORRADE_ASSERT(_compressed, "Trade::ImageData::type(): the image is not compressed", (CompressedImageView<dimensions>{_compressedStorage, _compressedFormat, _size}));    return CompressedImageView<dimensions>{        _compressedStorage,        _compressedFormat, _size, _data};}

Trade::MeshData3D UVSphere::solid(UnsignedInt rings, UnsignedInt segments, TextureCoords textureCoords) {    CORRADE_ASSERT(rings >= 2 && segments >= 3, "UVSphere must have at least two rings and three segments", Trade::MeshData3D(Mesh::Primitive::Triangles, {}, {}, {}, {}));    Implementation::Spheroid sphere(segments, textureCoords == TextureCoords::Generate ?        Implementation::Spheroid::TextureCoords::Generate :        Implementation::Spheroid::TextureCoords::DontGenerate);    Float textureCoordsVIncrement = 1.0f/rings;    Rad ringAngleIncrement(Constants::pi()/rings);    /* Bottom cap vertex */    sphere.capVertex(-1.0f, -1.0f, 0.0f);    /* Vertex rings */    sphere.hemisphereVertexRings(rings-1, 0.0f, -Rad(Constants::pi())/2+ringAngleIncrement, ringAngleIncrement, textureCoordsVIncrement, textureCoordsVIncrement);    /* Top cap vertex */    sphere.capVertex(1.0f, 1.0f, 1.0f);    /* Faces */    sphere.bottomFaceRing();    sphere.faceRings(rings-2);    sphere.topFaceRing();    return sphere.finalize();}

Shader& Shader::addFile(const std::string& filename) {    CORRADE_ASSERT(Utility::Directory::fileExists(filename),        "Shader file " << '/'' + filename + '/'' << " cannot be read.", *this);    addSource(Utility::Directory::readString(filename));    return *this;}

Containers::Array<unsigned char> AbstractFontConverter::doExportFontToSingleData(AbstractFont&, GlyphCache&, const std::u32string&) const#elseContainers::Array<unsigned char> AbstractFontConverter::doExportFontToSingleData(AbstractFont&, GlyphCache&, const std::vector<char32_t>&) const#endif{    CORRADE_ASSERT(false,        "Text::AbstractFontConverter::exportFontToSingleData(): feature advertised but not implemented", nullptr);}

AbstractTexture* AbstractTexture::generateMipmap() {    #ifndef MAGNUM_TARGET_GLES    CORRADE_ASSERT(_target != GL_TEXTURE_RECTANGLE, "AbstractTexture: rectangle textures cannot have mipmaps", this);    #endif    (this->*mipmapImplementation)();    return this;}

std::vector<std::pair<std::string, Containers::Array<char>>> AbstractFontConverter::doExportGlyphCacheToData(GlyphCache& cache, const std::string& filename) const {    CORRADE_ASSERT(!(features() & Feature::MultiFile),                   "Text::AbstractFontConverter::exportGlyphCacheToData(): feature advertised but not implemented", {});    std::vector<std::pair<std::string, Containers::Array<char>>> out;    out.emplace_back(filename, std::move(doExportGlyphCacheToSingleData(cache)));    return out;}

bool Sdl2Application::tryCreateContext(const Configuration& configuration) {    CORRADE_ASSERT(!context, "Platform::Sdl2Application::tryCreateContext(): context already created", false);    /* Enable double buffering and 24bt depth buffer */    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);    /* Multisampling */    SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, configuration.sampleCount() > 1 ? 1 : 0);    SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, configuration.sampleCount());    #ifndef CORRADE_TARGET_EMSCRIPTEN    /* Context flags */    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, int(configuration.flags()));    #endif    /* Flags: if not hidden, set as shown */    Uint32 windowFlags(configuration.windowFlags());    if(!(configuration.windowFlags() & Configuration::WindowFlag::Hidden)) windowFlags |= SDL_WINDOW_SHOWN;    /** @todo Remove when Emscripten has proper SDL2 support */    #ifndef CORRADE_TARGET_EMSCRIPTEN    /* Set context version, if requested */    if(configuration.version() != Version::None) {        Int major, minor;        std::tie(major, minor) = version(configuration.version());        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, major);        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, minor);        #ifndef MAGNUM_TARGET_GLES        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, configuration.version() >= Version::GL310 ?            SDL_GL_CONTEXT_PROFILE_CORE : SDL_GL_CONTEXT_PROFILE_COMPATIBILITY);        #else        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);        #endif    }    #ifdef MAGNUM_TARGET_GLES    else {        #ifdef MAGNUM_TARGET_GLES3        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);        #elif defined(MAGNUM_TARGET_GLES2)        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);        #else        #error Unsupported OpenGL ES version        #endif        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);    }    /* On OS X we need to create 3.2 context, as the default (2.1) contains       compatibility features which are not implemented for newer GL versions       in Apple's GL drivers, thus we would be forever stuck on 2.1 without the       new features. In practice SDL fails to create 2.1 context on recent OS X       versions. */    #elif defined(__APPLE__)    else {

template<class Transformation> Object<Transformation>& Object<Transformation>::setParentKeepTransformation(Object<Transformation>* parent) {    CORRADE_ASSERT(scene() == parent->scene(), "SceneGraph::Object::setParentKeepTransformation(): both parents must be in the same scene", *this);    const auto transformation = Implementation::Transformation<Transformation>::compose(        Implementation::Transformation<Transformation>::inverted(parent->absoluteTransformation()), absoluteTransformation());    setParent(parent);    Transformation::setTransformation(transformation);    return *this;}

std::pair<Float, Float> AbstractFont::doOpenFile(const std::string& filename, const Float size) {    CORRADE_ASSERT(features() & Feature::OpenData && !(features() & Feature::MultiFile),        "Text::AbstractFont::openFile(): not implemented", {});    /* Open file */    if(!Utility::Directory::fileExists(filename)) {        Error() << "Trade::AbstractFont::openFile(): cannot open file" << filename;        return {};    }    return doOpenSingleData(Utility::Directory::read(filename), size);}

void* Buffer::mapSub(const GLintptr offset, const GLsizeiptr length, const MapAccess access) {    /** @todo Enable also in Emscripten (?) when extension loader is available */    #ifdef CORRADE_TARGET_NACL    CORRADE_ASSERT(!_mappedBuffer, "Buffer::mapSub(): the buffer is already mapped", nullptr);    return _mappedBuffer = glMapBufferSubDataCHROMIUM(GLenum(bindInternal(_targetHint)), offset, length, GLenum(access));    #else    CORRADE_INTERNAL_ASSERT(false);    static_cast<void>(offset);    static_cast<void>(length);    static_cast<void>(access);    #endif}

template<> Long AbstractQuery::result<Long>() {    CORRADE_ASSERT(!target, "AbstractQuery::result(): the query is currently running", {});    /** @todo Re-enable when extension loader is available for ES */    Long result;    #ifndef MAGNUM_TARGET_GLES    glGetQueryObjecti64v(_id, GL_QUERY_RESULT, &result);    #else    CORRADE_INTERNAL_ASSERT(false);    //glGetQueryObjecti64vEXT(_id, GL_QUERY_RESULT, &result);    #endif    return result;}

bool AbstractImageConverter::doExportToFile(const ImageView2D& image, const std::string& filename) {    CORRADE_ASSERT(features() & Feature::ConvertData, "Trade::AbstractImageConverter::exportToFile(): not implemented", false);    const auto data = doExportToData(image);    if(!data) return false;    /* Open file */    if(!Utility::Directory::write(filename, data)) {        Error() << "Trade::AbstractImageConverter::exportToFile(): cannot write to file" << filename;        return false;    }    return true;}

std::pair<std::vector<UnsignedInt>, std::vector<UnsignedInt>> combineIndexArrays(const std::vector<UnsignedInt>& interleavedArrays, const UnsignedInt stride) {    CORRADE_ASSERT(stride != 0, "MeshTools::combineIndexArrays(): stride can't be zero", {});    CORRADE_ASSERT(interleavedArrays.size() % stride == 0, "MeshTools::combineIndexArrays(): array size is not divisible by stride", {});    /* Hash map with index combinations, containing just indices into       interleavedArrays vector, hashing and comparison is done using IndexHash       and IndexEqual functors. Reserving more buckets than necessary (i.e. as       if each combination was unique). */    std::unordered_map<UnsignedInt, UnsignedInt, IndexHash, IndexEqual> indexCombinations(        interleavedArrays.size()/stride,        IndexHash(interleavedArrays, stride),        IndexEqual(interleavedArrays, stride));    /* Make the index combinations unique. Original indices into original       `interleavedArrays` array were 0, 1, 2, 3, ..., `combinedIndices`       contains new ones into new (shorter) `newInterleavedArrays` array. */    std::vector<UnsignedInt> combinedIndices;    combinedIndices.reserve(interleavedArrays.size()/stride);    std::vector<UnsignedInt> newInterleavedArrays;    for(std::size_t oldIndex = 0, end = interleavedArrays.size()/stride; oldIndex != end; ++oldIndex) {        /* Try to insert new index combination to the map */        const auto result = indexCombinations.emplace(oldIndex, indexCombinations.size());        /* Add the (either new or already existing) index to resulting index array */        combinedIndices.push_back(result.first->second);        /* If this is new combination, copy it to new interleaved arrays */        if(result.second) newInterleavedArrays.insert(newInterleavedArrays.end(),            interleavedArrays.begin()+oldIndex*stride,            interleavedArrays.begin()+(oldIndex+1)*stride);    }    CORRADE_INTERNAL_ASSERT(combinedIndices.size() == interleavedArrays.size()/stride &&                            newInterleavedArrays.size() <= interleavedArrays.size());    return {std::move(combinedIndices), std::move(newInterleavedArrays)};}

bool AbstractXApplication::tryCreateContext(const Configuration& configuration) {    CORRADE_ASSERT(!_context, "AbstractXApplication::tryCreateContext(): context already created", false);    _viewportSize = configuration.size();    /* Get default X display */    _display = XOpenDisplay(nullptr);    /* Get visual ID */    VisualID visualId = _contextHandler->getVisualId(_display);    /* Get visual info */    XVisualInfo *visInfo, visTemplate;    int visualCount;    visTemplate.visualid = visualId;    visInfo = XGetVisualInfo(_display, VisualIDMask, &visTemplate, &visualCount);    if(!visInfo) {        Error() << "Platform::WindowlessGlxApplication::tryCreateContext(): cannot get X visual";        return false;    }    /* Create X Window */    Window root = RootWindow(_display, DefaultScreen(_display));    XSetWindowAttributes attr;    attr.background_pixel = 0;    attr.border_pixel = 0;    attr.colormap = XCreateColormap(_display, root, visInfo->visual, AllocNone);    attr.event_mask = 0;    unsigned long mask = CWBackPixel|CWBorderPixel|CWColormap|CWEventMask;    _window = XCreateWindow(_display, root, 20, 20, configuration.size().x(), configuration.size().y(), 0, visInfo->depth, InputOutput, visInfo->visual, mask, &attr);    XSetStandardProperties(_display, _window, configuration.title().data(), nullptr, 0, nullptr, 0, nullptr);    XFree(visInfo);    /* Be notified about closing the window */    _deleteWindow = XInternAtom(_display, "WM_DELETE_WINDOW", True);    XSetWMProtocols(_display, _window, &_deleteWindow, 1);    /* Create context */    _contextHandler->createContext(configuration, _window);    /* Capture exposure, keyboard and mouse button events */    XSelectInput(_display, _window, INPUT_MASK);    /* Set OpenGL context as current */    _contextHandler->makeCurrent();    _context.reset(new Platform::Context);    return true;}

bool Shader::compile() {    CORRADE_ASSERT(sources.size() > 1, "Shader::compile(): no files added", false);    /* Array of sources */    const GLchar** _sources = new const GLchar*[sources.size()];    for(std::size_t i = 0; i != sources.size(); ++i)        _sources[i] = static_cast<const GLchar*>(sources[i].c_str());    /* Create shader and set its source */    glShaderSource(_id, sources.size(), _sources, nullptr);    /* Compile shader */    glCompileShader(_id);    delete _sources;    /* Check compilation status */    GLint success, logLength;    glGetShaderiv(_id, GL_COMPILE_STATUS, &success);    glGetShaderiv(_id, GL_INFO_LOG_LENGTH, &logLength);    /* Error or warning message. The string is returned null-terminated, scrap       the /0 at the end afterwards */    std::string message(logLength, '/0');    if(message.size() > 1)        glGetShaderInfoLog(_id, message.size(), nullptr, &message[0]);    message.resize(std::max(logLength, 1)-1);    /* Show error log */    if(!success) {        Error out;        out.setFlag(Debug::NewLineAtTheEnd, false);        out.setFlag(Debug::SpaceAfterEachValue, false);        out << "Shader: " << shaderName(_type)            << " shader failed to compile with the following message:/n"            << message;    /* Or just message, if any */    } else if(!message.empty()) {        Error out;        out.setFlag(Debug::NewLineAtTheEnd, false);        out.setFlag(Debug::SpaceAfterEachValue, false);        out << "Shader: " << shaderName(_type)            << " shader was successfully compiled with the following message:/n"            << message;    }    return success;}

bool WindowlessCglApplication::tryCreateContext(const Configuration&) {    CORRADE_ASSERT(!_context, "Platform::WindowlessCglApplication::tryCreateContext(): context already created", false);    int formatCount;    CGLPixelFormatAttribute attributes32[] = {        kCGLPFAAccelerated,        kCGLPFAOpenGLProfile,        CGLPixelFormatAttribute(kCGLOGLPVersion_3_2_Core),        CGLPixelFormatAttribute(0)    };    if(CGLChoosePixelFormat(attributes32, &_pixelFormat, &formatCount) != kCGLNoError) {        Error() << "Platform::WindowlessCglApplication::tryCreateContext(): cannot choose pixel format for GL 3.2, falling back to 3.0";        CGLPixelFormatAttribute attributes30[] = {            kCGLPFAAccelerated,            kCGLPFAOpenGLProfile,            CGLPixelFormatAttribute(kCGLOGLPVersion_GL3_Core),            CGLPixelFormatAttribute(0)        };        if(CGLChoosePixelFormat(attributes30, &_pixelFormat, &formatCount) != kCGLNoError) {            Error() << "Platform::WindowlessCglApplication::tryCreateContext(): cannot choose pixel format for GL 3.0, falling back to 2.1";            CGLPixelFormatAttribute attributes21[] = {                kCGLPFAAccelerated,                kCGLPFAOpenGLProfile,                CGLPixelFormatAttribute(kCGLOGLPVersion_Legacy),                CGLPixelFormatAttribute(0)            };            if(CGLChoosePixelFormat(attributes21, &_pixelFormat, &formatCount) != kCGLNoError) {                Error() << "Platform::WindowlessCglApplication::tryCreateContext(): cannot choose pixel format";                return false;            }        }    }    if(CGLCreateContext(_pixelFormat, nullptr, &_glContext) != kCGLNoError) {        Error() << "Platform::WindowlessCglApplication::tryCreateContext(): cannot create context";        return false;    }    if(CGLSetCurrentContext(_glContext) != kCGLNoError) {        Error() << "Platform::WindowlessCglApplication::tryCreateContext(): cannot make context current";        return false;    }    _context.reset(new Platform::Context);    return true;}

Trade::MeshData2D Circle::wireframe(UnsignedInt segments) {    CORRADE_ASSERT(segments >= 3, "Primitives::Circle::wireframe(): segments must be >= 3",        Trade::MeshData2D(Mesh::Primitive::LineLoop, {}, {}, {}));    std::vector<Vector2> positions;    positions.reserve(segments);    /* Points on circle */    const Rad angleIncrement(2*Constants::pi()/segments);    for(UnsignedInt i = 0; i != segments; ++i) {        const Rad angle(i*angleIncrement);        positions.emplace_back(Math::cos(angle), Math::sin(angle));    }    return Trade::MeshData2D(Mesh::Primitive::LineLoop, {}, {std::move(positions)}, {});}

Trade::MeshData3D Cylinder::wireframe(const UnsignedInt rings, const UnsignedInt segments, const Float halfLength) {    CORRADE_ASSERT(rings >= 1 && segments >= 4 && segments%4 == 0, "Primitives::Cylinder::wireframe(): improper parameters", Trade::MeshData3D(MeshPrimitive::Lines, {}, {}, {}, {}));    Implementation::WireframeSpheroid cylinder(segments/4);    const Float increment = 2*halfLength/rings;    /* Rings */    cylinder.ring(-halfLength);    for(UnsignedInt i = 0; i != rings; ++i) {        cylinder.cylinder();        cylinder.ring(-halfLength + (i+1)*increment);    }    return cylinder.finalize();}